A consideration of whats involved in determining limits and conditions for being under the influence of cannabis while driving; a new study looking at the relationship between stress and relapse, and effects of the kappa opioids receptor being blocked in reducing relapse. Also new research on the inhibatory GABA and excitatory glutamate neurotransmitters – showing there is more than just dopamine involved with addiction and the stop-go switch of the brain. Finally changes in society now reflect near parity in rate of addiction of women vs men. And how mild traumatic brain injury can increase possibility of alcohol abuse and addiction. PODCAST.